Re: PROBLEM: RAID-1 Assembly at Boot Time - LVM Impact

[Max Meyer <max.10.newsgroup@arcor.de>]

Martin,

first of all, thank you very much for the fast response.

martin f krafft schrieb:
> Yes, this may well be the problem. However, I would not be able to
> tell since you did not include any relevant information with your
> initial email. Please send me the mdadm -E and mdadm -D outputs you
> alluded to.

I have included the information at the end.

> If the problem is really because of a wrong homehost field, then 
> 
>   mdadm -A /dev/mdX --homehost=whatever --update=homehost /dev/XXXX.....
> 
> is the way to fix it, meaning you assemble the array and force the
> update of the superblock information. Neil Brown, the author, was
> kind enough to take a look at your problem and the above is his
> suggestion. If that doesn't work, we need more information.

This is very kind. Unfortunately,

mdadm -A /dev/md4 --homehost=mercury --update=homehost --auto=yes /dev/hde2 /dev/hdf2

didn't solve the problem, but there is another interesting point:

o as far as I understood from the available documentation, that homehost is stored in UUID=A:B:<here>:<here>
o the arrays /dev/md0 and /dev/md1 had been created in 2005 and had been "converted" while installing the
  new package versions, showing now both a4b55d23:82b70df8
o for /dev/md3 being created after the package update, I tried already before --homehost=mercury --update=homehost
  and for /dev/md4 today, showing now both ef85aaf3:69789572 (which is different)

Thank you all for further support in advance!

Ciao
Max

> mdadm -D --scan

ARRAY /dev/md1 level=raid1 num-devices=2 UUID=3eae8d0d:8e2777a8:a4b55d23:82b70df8
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=dbf5842c:f9e1d0f0:a4b55d23:82b70df8

> mdadm -E --scan

ARRAY /dev/md0 level=raid1 num-devices=2 UUID=dbf5842c:f9e1d0f0:a4b55d23:82b70df8
ARRAY /dev/md1 level=raid1 num-devices=2 UUID=3eae8d0d:8e2777a8:a4b55d23:82b70df8
ARRAY /dev/md3 level=raid1 num-devices=2 UUID=673735db:f3bcbe6e:ef85aaf3:69789572
ARRAY /dev/md4 level=raid1 num-devices=2 UUID=5acae97b:8517e289:44e82faf:d72d3fc1
ARRAY /dev/md5 level=raid1 num-devices=2 UUID=f50f166e:d3e13df6:15c27e68:cee986f9

> mdadm -E /dev/md0

mdadm: No md superblock detected on /dev/md0.

> mdadm -E /dev/md1

mdadm: No md superblock detected on /dev/md1.

> mdadm -D /dev/md0

        Version : 00.90.03
  Creation Time : Sat Jul  9 18:08:07 2005
     Raid Level : raid1
     Array Size : 979840 (957.04 MiB 1003.36 MB)
    Device Size : 979840 (957.04 MiB 1003.36 MB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sat Dec 16 16:45:56 2006
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : dbf5842c:f9e1d0f0:a4b55d23:82b70df8
         Events : 0.526

    Number   Major   Minor   RaidDevice State
       0       3        1        0      active sync   /dev/hda1
       1       3       65        1      active sync   /dev/hdb1

> mdadm -D /dev/md1

        Version : 00.90.03
  Creation Time : Sat Jul  9 18:08:24 2005
     Raid Level : raid1
     Array Size : 44050112 (42.01 GiB 45.11 GB)
    Device Size : 44050112 (42.01 GiB 45.11 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Sat Dec 16 16:45:57 2006
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 3eae8d0d:8e2777a8:a4b55d23:82b70df8
         Events : 0.46754

    Number   Major   Minor   RaidDevice State
       0       3        2        0      active sync   /dev/hda2
       1       3       66        1      active sync   /dev/hdb2

> mdadm -A /dev/md4 --homehost=mercury --update=homehost --auto=yes /dev/hde2 /dev/hdf2

> mdadm -E /dev/md4

mdadm: No md superblock detected on /dev/md4.

> mdadm -D /dev/md4

        Version : 00.90.03
  Creation Time : Tue Dec 12 20:07:06 2006
     Raid Level : raid1
     Array Size : 310126720 (295.76 GiB 317.57 GB)
    Device Size : 310126720 (295.76 GiB 317.57 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 4
    Persistence : Superblock is persistent

    Update Time : Sat Dec 16 16:39:21 2006
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 5acae97b:8517e289:ef85aaf3:69789572
         Events : 0.2

    Number   Major   Minor   RaidDevice State
       0      33        2        0      active sync   /dev/hde2
       1      33       66        1      active sync   /dev/hdf2